Drive-chain.



Hl HESS.

DRIVE CHAIN.

APPucmou man ocmo. ma.

1,151,587. Patented Aug. 31, 1915.

HENRY HESS,A QF 'WA'WL PENNSYLVANIA.

DRIVE-CHAIN.

lpeoinoltioii o! Letters Patent.

Patented aug. 31, 1915.

Application filed October 16. 1908. Serial No. 458,010.

To all whom it may concern.'

Be it known that I, HENRY Hass, a citizen of the United States, residing at Wawa, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Drive-Chains, of which. the following is a specification, reference bein had therein to the accompanying drawing.

This invention relates to drive chains in which the links are formed to engage lugs or projections on the wheel, by which means the latter is driven positively by the chain, the objects of the invention bein to aid the positive driving action of the c ain. and also to cushion the engagement of the parts. so as to prevent noise or rattling.

With these ends in view, my invention consists in so forming the links of the chain, that in addition to their positive driving action on the wheel, the links will act with a frictional effect or grip, with the result that the wheel will be subjected to both a ositive and frictional driving action, the rictional action serving to cause the parts to engage with a cushioning effect, thereby preventing rattlin or click, and providing a silent running rive.

In the accompanying drawings: Fi ure 1 is a side elevation of a sprocket-Whse and a section of driving chain embodying m invention; Fig. 2 is a top plan view o the saine; Fig. 3 is a vertical transverse section on the line a-a of Fig. 1.

Referring to the rawings: In the embodiment of the invention illustrated, the chain 1 consists of alternately arranlged 'positive driving links 2, and frictiona driving links 3, jointed together end to end, the links 2 being provided with inwardly extending projections or teeth 4, adapted to engage between lugs or pins extending etween walls 6 of a peripheral groove in the wheel 7, the engagement of the teeth with the pins causing the wheel to be driven with a positive action. The frictional' drivinglinks 3 are of such forni in cross-section t at they will fit closely between the walls of the ei-ipheral groove, so as to bind or wed)ge therein to a degree sufiicient to exert a grip on the walls, and thereby aid the positive driving action of the teeth on the pins. As shown more particularly in Fig. the walls of the groove slopel or flare outward, and the links 3 are beveled or inclined at their sides to bear flatly against the sloping wallsl and act with a wedging action therebetween, these links being preferably formed of some yielding materia in order that they may act with a cushionin effect to dcaden the contact of tlie arts an thereby prevent rattling or click. n their preferred construction the frictional links are in the forni of blocks of some durable but slightly yielding or cushioning material, the ends of which are provided with open slots in which the ends of the connecting positive driving links 2 are seated and pivoted bv means of transverse pivot pins 8, the heads of which are coantersunk so as not to engage the walls of the groove. The links 2 are preferably in the forni of flat metal plates with the driving teeth foi-ined integral therewith, as shown in Fig. 1.

It is mani est that my invention is not re- 'stricted to tlie specific embodiment shown,

either as re rards the type of chain or wheel, and it is to e understood that the invention is not limited to any specific form or arrangement of the parts, except in so far as sach limitations are specified in the claims.

Having thus described my invention, what I claim and desire to secure by Lettliers-Patent of the United States is as folows:

1. In combination with a wheel having drivinglugs, a. driving chain comprising positive driving elements -and frictional driving elements jointed to the first mentioned elements, the said positive driving elements engaging the lugs and acting on the wheel with a. positive driving action only, and the said frictional driving elements enga ing the wheel and acting thereon with a rictional driving action only.

2. A driving chain comprising connected links, certain of said links being formed of hard iinyielding material and adapted to engage and drive a wheel with a positive drivin action, and other of the links being forme of a yielding material and adapted to engage and drive the wheel with a frictiona driving action.

3. In com ination with a wheel formed with a peripheral groove and transverse driving pins extending between the walls of the. grooves at intervals, a drive chain comprising connected links, the alternate links being provided with frctonal sur- In testimony whereof I have affixed my faciles ndlnpted to engge the walls 3f the pf signature in presence of two witnesses. rip iern .groove an u cting to rive t e ,1 wheel with n fiictionnl action, und the other HENRY HLSS' 5 links being novicled with inwardly extend- Witnesses:

ing teeth u opted to engage the pine und MARY MCCALLA, drive the wheel with u positive action. Nm'rm L. HAHN.

Copies of this pntentmay be obtaned for tive cents each, ny addressing the Commissioner ot Patents, Washington, D. 0. 

